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| nuclear fission The division of an atomic nucleus into parts of comparable mass; usually restricted to heavier nuclei such as isotopes of uranium, plutonium, and thorium | |||
| nuclear fission; fission | |||
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| nuclear fission The division of an atomic nucleus into parts of comparable mass; usually restricted to heavier nuclei such as isotopes of uranium, plutonium, and thorium | |||
| nuclear fission; fission | |||
